booster/no booster
 

When do I need to use a booster/rcvr pack?

With all 2s/3s speedo's?

Do any 1s speedo's need a booster?

Thanks for any replys.

You need a voltage booster for most speedos on 1S. You don't need a booster with the ORCA VX1, Hobbywing 1S, or the Viper VTX1, from what I remember.

speed passion
 

REVENTON PRO 1.1 Ex by speed passion is very good for racing with 1cell. It's just plug and go without a receiver pack. It can be used with 2 cell just as well without any problems.

Thought some of you old-timers would like to see an antique collectable pin from the early years, was anyone here at this race? I also went out there a year or 2 earlier for my first time and actually ran the expert B Main......to my surprise!

http://i108.photobucket.com/albums/n...s/DSCN2952.jpg

Hey, that you Mark? I think I was there with the old Tuna Boat Winnebago.

WOW, not only did I find someone that was there in 1982....I found my pit buddy for the weekend....cool!! Pitting in the RV was so cool....we had it made! :tire:

Still looking forward to hooking up again, as soon as I can get down to Tucson. Ever since getting a job and my sister moved up to my place I don't get the time to go down there.

Take care LJ, hope everyone is doing better.

ssssshhhhhhh I thought that was a top secret video! :tire::tire:
;)

This will sound like a super newbie question, but I've always questioned this adjustment.

On the kingpin there are multiple spacers that you can place above or below the steering block, and above the upper link. Now, most setup manuals state this is for ride height. However, I can't help but wonder if this is also for adjusting roll centers? Am I right in thinking this? Or is roll center adjustment dependent on length of lower arm and upper arm.

That's definitely not a newbie question. Determination and adjustment of roll centers is almost a science unto itself. If your car has pivoting upper and lower arms, then it is a double-wishbone arrangement; if the lower arm is fixed, with the kingpin sliding through it, and the upper arm pivots, then it is an upside-down MacPherson strut. You can find many treatises on the internet on how to calculate roll centers for either arrangement.

And to answer your question, yes, the spacers can be used to make small adjustments to the roll center.

Thank you for your response. But, the primary adjustment is to adjust the ride height and secondary is roll center?

I also heard going to softer springs will result in more roll. Which is interesting.

I have a tire question for you guys. When would you choose a hi-rubber content over a low-rubber content? I see some companies have "Medium compound low-rubber content" tires, and also "Medium compound hi-rubber content". I'm guessing the hi-rubber content tires will heat up as the race goes on, maybe getting gummed up?

That depends on how the spacers are placed. If you are moving the entire spindle up or down to maintain a given ride height as the tires wear, leaving the angle and height of the arms unchanged, then the roll center doesn't change. If the angle or height of the arms change, then the roll center will change.

Changing the roll center on the front of a 1/12 scale car usually gives a relatively minor change in handling, with the spring rate and ride height dominating the effects. Interestingly, changing the reactive caster setting on a "dynamic strut" (upside-down MacPherson strut) has a pretty substantial effect on the roll center, but nobody ever seems to mention it.

That's almost always the case. But if the roll center way is up at the CG, then the chassis won't lean at all during cornering, no matter how soft the springs. (Formula Vees have long used NO springs for roll stiffness on the rear, since the roll center is so high. This is called, appropriately enough, a "zero roll" rear end.)

Hi

Has anyone tried fitting the new Trinity D4 in a 1:12 car? I looks from the pictures that they have excluded som mounting holes that will make it a difficult fit in a standard pod, am i mistaken?